HT46R017 datasheet(35/91 Pages) HOLTEK

35 / 91 page

Rev. 1.00

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Rev. 1.00

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HT46R016/HT46R017

Enhanced A/D 8-Bit OTP MCU

Reset Initial Conditions

The different types of reset described affect the reset flags in different ways. These flags, known

as PDF and TO are located in the status register and are controlled by various microcontroller

operations, such as the Power Down Mode function or Watchdog Timer. The reset flags are shown in

the table:

PDF

RESET Conditions

Power-on reset

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LVR reset d�ring NORMAL Mode operation

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WDT time-o�t reset d�ring NORMAL Mode operation

WDT time-o�t reset d�ring Power down Mode operation

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The following table indicates the way in which the various components of the microcontroller are

affected after a power-on reset occurs.

Item

Condition After RESET

Program Co�nter

Reset to zero

Interr�pts

A�� interr�pts wi�� be disab�ed

Presca�er� Divider

C�eared

WDT

C�ear after reset� WDT begins co�nting

Timer/Event Co�nter Timer Co�nter wi�� be t�rned off

Inp�t/O�tp�t Ports

I/O ports wi�� be set�p as inp�ts

Stack Pointer

Stack Pointer wi�� point to the top of the stack

The different kinds of resets all affect the internal registers of the microcontroller in different ways.

To ensure reliable continuation of normal program execution after a reset occurs, it is important to

know what condition the microcontroller is in after a particular reset occurs. The following table

describes how each type of reset affects the microcontroller internal registers.

HT46R017 Datasheet(PDF) 35 Page - Holtek Semiconductor Inc